1 /*
2 * Copyright (c) 1994, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package java.lang;
26
27 import java.io.*;
28 import java.lang.reflect.Executable;
29 import java.lang.annotation.Annotation;
30 import java.security.AccessControlContext;
31 import java.util.Properties;
32 import java.util.PropertyPermission;
33 import java.util.Map;
34 import java.security.AccessController;
35 import java.security.PrivilegedAction;
36 import java.nio.channels.Channel;
37 import java.nio.channels.spi.SelectorProvider;
38 import java.util.Objects;
39 import java.util.ResourceBundle;
40 import java.util.function.Supplier;
41 import sun.nio.ch.Interruptible;
42 import sun.reflect.CallerSensitive;
43 import sun.reflect.Reflection;
44 import sun.security.util.SecurityConstants;
45 import sun.reflect.annotation.AnnotationType;
46 import jdk.internal.HotSpotIntrinsicCandidate;
47 import jdk.internal.misc.JavaLangAccess;;
48 import jdk.internal.misc.SharedSecrets;;
49 import jdk.internal.misc.VM;
50 import jdk.internal.logger.LoggerFinderLoader;
51 import jdk.internal.logger.LazyLoggers;
52 import jdk.internal.logger.LocalizedLoggerWrapper;
53
54 /**
55 * The <code>System</code> class contains several useful class fields
56 * and methods. It cannot be instantiated.
57 *
58 * <p>Among the facilities provided by the <code>System</code> class
59 * are standard input, standard output, and error output streams;
60 * access to externally defined properties and environment
61 * variables; a means of loading files and libraries; and a utility
62 * method for quickly copying a portion of an array.
63 *
64 * @author unascribed
65 * @since 1.0
66 */
67 public final class System {
68
69 /* register the natives via the static initializer.
70 *
71 * VM will invoke the initializeSystemClass method to complete
72 * the initialization for this class separated from clinit.
73 * Note that to use properties set by the VM, see the constraints
74 * described in the initializeSystemClass method.
75 */
76 private static native void registerNatives();
77 static {
78 registerNatives();
79 }
80
81 /** Don't let anyone instantiate this class */
82 private System() {
83 }
84
85 /**
86 * The "standard" input stream. This stream is already
87 * open and ready to supply input data. Typically this stream
88 * corresponds to keyboard input or another input source specified by
89 * the host environment or user.
90 */
91 public static final InputStream in = null;
92
93 /**
94 * The "standard" output stream. This stream is already
95 * open and ready to accept output data. Typically this stream
96 * corresponds to display output or another output destination
97 * specified by the host environment or user.
98 * <p>
99 * For simple stand-alone Java applications, a typical way to write
100 * a line of output data is:
101 * <blockquote><pre>
102 * System.out.println(data)
103 * </pre></blockquote>
104 * <p>
105 * See the <code>println</code> methods in class <code>PrintStream</code>.
106 *
107 * @see java.io.PrintStream#println()
108 * @see java.io.PrintStream#println(boolean)
109 * @see java.io.PrintStream#println(char)
110 * @see java.io.PrintStream#println(char[])
111 * @see java.io.PrintStream#println(double)
112 * @see java.io.PrintStream#println(float)
113 * @see java.io.PrintStream#println(int)
114 * @see java.io.PrintStream#println(long)
115 * @see java.io.PrintStream#println(java.lang.Object)
116 * @see java.io.PrintStream#println(java.lang.String)
117 */
118 public static final PrintStream out = null;
119
120 /**
121 * The "standard" error output stream. This stream is already
122 * open and ready to accept output data.
123 * <p>
124 * Typically this stream corresponds to display output or another
125 * output destination specified by the host environment or user. By
126 * convention, this output stream is used to display error messages
127 * or other information that should come to the immediate attention
128 * of a user even if the principal output stream, the value of the
129 * variable <code>out</code>, has been redirected to a file or other
130 * destination that is typically not continuously monitored.
131 */
132 public static final PrintStream err = null;
133
134 /* The security manager for the system.
135 */
136 private static volatile SecurityManager security;
137
138 /**
139 * Reassigns the "standard" input stream.
140 *
141 * <p>First, if there is a security manager, its <code>checkPermission</code>
142 * method is called with a <code>RuntimePermission("setIO")</code> permission
143 * to see if it's ok to reassign the "standard" input stream.
144 *
145 * @param in the new standard input stream.
146 *
147 * @throws SecurityException
148 * if a security manager exists and its
149 * <code>checkPermission</code> method doesn't allow
150 * reassigning of the standard input stream.
151 *
152 * @see SecurityManager#checkPermission
153 * @see java.lang.RuntimePermission
154 *
155 * @since 1.1
156 */
157 public static void setIn(InputStream in) {
158 checkIO();
159 setIn0(in);
160 }
161
162 /**
163 * Reassigns the "standard" output stream.
164 *
165 * <p>First, if there is a security manager, its <code>checkPermission</code>
166 * method is called with a <code>RuntimePermission("setIO")</code> permission
167 * to see if it's ok to reassign the "standard" output stream.
168 *
169 * @param out the new standard output stream
170 *
171 * @throws SecurityException
172 * if a security manager exists and its
173 * <code>checkPermission</code> method doesn't allow
174 * reassigning of the standard output stream.
175 *
176 * @see SecurityManager#checkPermission
177 * @see java.lang.RuntimePermission
178 *
179 * @since 1.1
180 */
181 public static void setOut(PrintStream out) {
182 checkIO();
183 setOut0(out);
184 }
185
186 /**
187 * Reassigns the "standard" error output stream.
188 *
189 * <p>First, if there is a security manager, its <code>checkPermission</code>
190 * method is called with a <code>RuntimePermission("setIO")</code> permission
191 * to see if it's ok to reassign the "standard" error output stream.
192 *
193 * @param err the new standard error output stream.
194 *
195 * @throws SecurityException
196 * if a security manager exists and its
197 * <code>checkPermission</code> method doesn't allow
198 * reassigning of the standard error output stream.
199 *
200 * @see SecurityManager#checkPermission
201 * @see java.lang.RuntimePermission
202 *
203 * @since 1.1
204 */
205 public static void setErr(PrintStream err) {
206 checkIO();
207 setErr0(err);
208 }
209
210 private static volatile Console cons;
211 /**
212 * Returns the unique {@link java.io.Console Console} object associated
213 * with the current Java virtual machine, if any.
214 *
215 * @return The system console, if any, otherwise {@code null}.
216 *
217 * @since 1.6
218 */
219 public static Console console() {
220 Console c = cons;
221 if (c == null) {
222 synchronized (System.class) {
223 cons = c = SharedSecrets.getJavaIOAccess().console();
224 }
225 }
226 return c;
227 }
228
229 /**
230 * Returns the channel inherited from the entity that created this
231 * Java virtual machine.
232 *
233 * <p> This method returns the channel obtained by invoking the
234 * {@link java.nio.channels.spi.SelectorProvider#inheritedChannel
235 * inheritedChannel} method of the system-wide default
236 * {@link java.nio.channels.spi.SelectorProvider} object. </p>
237 *
238 * <p> In addition to the network-oriented channels described in
239 * {@link java.nio.channels.spi.SelectorProvider#inheritedChannel
240 * inheritedChannel}, this method may return other kinds of
241 * channels in the future.
242 *
243 * @return The inherited channel, if any, otherwise {@code null}.
244 *
245 * @throws IOException
246 * If an I/O error occurs
247 *
248 * @throws SecurityException
249 * If a security manager is present and it does not
250 * permit access to the channel.
251 *
252 * @since 1.5
253 */
254 public static Channel inheritedChannel() throws IOException {
255 return SelectorProvider.provider().inheritedChannel();
256 }
257
258 private static void checkIO() {
259 SecurityManager sm = getSecurityManager();
260 if (sm != null) {
261 sm.checkPermission(new RuntimePermission("setIO"));
262 }
263 }
264
265 private static native void setIn0(InputStream in);
266 private static native void setOut0(PrintStream out);
267 private static native void setErr0(PrintStream err);
268
269 /**
270 * Sets the System security.
271 *
272 * <p> If there is a security manager already installed, this method first
273 * calls the security manager's <code>checkPermission</code> method
274 * with a <code>RuntimePermission("setSecurityManager")</code>
275 * permission to ensure it's ok to replace the existing
276 * security manager.
277 * This may result in throwing a <code>SecurityException</code>.
278 *
279 * <p> Otherwise, the argument is established as the current
280 * security manager. If the argument is <code>null</code> and no
281 * security manager has been established, then no action is taken and
282 * the method simply returns.
283 *
284 * @param s the security manager.
285 * @exception SecurityException if the security manager has already
286 * been set and its <code>checkPermission</code> method
287 * doesn't allow it to be replaced.
288 * @see #getSecurityManager
289 * @see SecurityManager#checkPermission
290 * @see java.lang.RuntimePermission
291 */
292 public static
293 void setSecurityManager(final SecurityManager s) {
294 try {
295 s.checkPackageAccess("java.lang");
296 } catch (Exception e) {
297 // no-op
298 }
299 setSecurityManager0(s);
300 }
301
302 private static synchronized
303 void setSecurityManager0(final SecurityManager s) {
304 SecurityManager sm = getSecurityManager();
305 if (sm != null) {
306 // ask the currently installed security manager if we
307 // can replace it.
308 sm.checkPermission(new RuntimePermission
309 ("setSecurityManager"));
310 }
311
312 if ((s != null) && (s.getClass().getClassLoader() != null)) {
313 // New security manager class is not on bootstrap classpath.
314 // Cause policy to get initialized before we install the new
315 // security manager, in order to prevent infinite loops when
316 // trying to initialize the policy (which usually involves
317 // accessing some security and/or system properties, which in turn
318 // calls the installed security manager's checkPermission method
319 // which will loop infinitely if there is a non-system class
320 // (in this case: the new security manager class) on the stack).
321 AccessController.doPrivileged(new PrivilegedAction<>() {
322 public Object run() {
323 s.getClass().getProtectionDomain().implies
324 (SecurityConstants.ALL_PERMISSION);
325 return null;
326 }
327 });
328 }
329
330 security = s;
331 }
332
333 /**
334 * Gets the system security interface.
335 *
336 * @return if a security manager has already been established for the
337 * current application, then that security manager is returned;
338 * otherwise, <code>null</code> is returned.
339 * @see #setSecurityManager
340 */
341 public static SecurityManager getSecurityManager() {
342 return security;
343 }
344
345 /**
346 * Returns the current time in milliseconds. Note that
347 * while the unit of time of the return value is a millisecond,
348 * the granularity of the value depends on the underlying
349 * operating system and may be larger. For example, many
350 * operating systems measure time in units of tens of
351 * milliseconds.
352 *
353 * <p> See the description of the class <code>Date</code> for
354 * a discussion of slight discrepancies that may arise between
355 * "computer time" and coordinated universal time (UTC).
356 *
357 * @return the difference, measured in milliseconds, between
358 * the current time and midnight, January 1, 1970 UTC.
359 * @see java.util.Date
360 */
361 @HotSpotIntrinsicCandidate
362 public static native long currentTimeMillis();
363
364 /**
365 * Returns the current value of the running Java Virtual Machine's
366 * high-resolution time source, in nanoseconds.
367 *
368 * <p>This method can only be used to measure elapsed time and is
369 * not related to any other notion of system or wall-clock time.
370 * The value returned represents nanoseconds since some fixed but
371 * arbitrary <i>origin</i> time (perhaps in the future, so values
372 * may be negative). The same origin is used by all invocations of
373 * this method in an instance of a Java virtual machine; other
374 * virtual machine instances are likely to use a different origin.
375 *
376 * <p>This method provides nanosecond precision, but not necessarily
377 * nanosecond resolution (that is, how frequently the value changes)
378 * - no guarantees are made except that the resolution is at least as
379 * good as that of {@link #currentTimeMillis()}.
380 *
381 * <p>Differences in successive calls that span greater than
382 * approximately 292 years (2<sup>63</sup> nanoseconds) will not
383 * correctly compute elapsed time due to numerical overflow.
384 *
385 * <p>The values returned by this method become meaningful only when
386 * the difference between two such values, obtained within the same
387 * instance of a Java virtual machine, is computed.
388 *
389 * <p>For example, to measure how long some code takes to execute:
390 * <pre> {@code
391 * long startTime = System.nanoTime();
392 * // ... the code being measured ...
393 * long elapsedNanos = System.nanoTime() - startTime;}</pre>
394 *
395 * <p>To compare elapsed time against a timeout, use <pre> {@code
396 * if (System.nanoTime() - startTime >= timeoutNanos) ...}</pre>
397 * instead of <pre> {@code
398 * if (System.nanoTime() >= startTime + timeoutNanos) ...}</pre>
399 * because of the possibility of numerical overflow.
400 *
401 * @return the current value of the running Java Virtual Machine's
402 * high-resolution time source, in nanoseconds
403 * @since 1.5
404 */
405 @HotSpotIntrinsicCandidate
406 public static native long nanoTime();
407
408 /**
409 * Copies an array from the specified source array, beginning at the
410 * specified position, to the specified position of the destination array.
411 * A subsequence of array components are copied from the source
412 * array referenced by <code>src</code> to the destination array
413 * referenced by <code>dest</code>. The number of components copied is
414 * equal to the <code>length</code> argument. The components at
415 * positions <code>srcPos</code> through
416 * <code>srcPos+length-1</code> in the source array are copied into
417 * positions <code>destPos</code> through
418 * <code>destPos+length-1</code>, respectively, of the destination
419 * array.
420 * <p>
421 * If the <code>src</code> and <code>dest</code> arguments refer to the
422 * same array object, then the copying is performed as if the
423 * components at positions <code>srcPos</code> through
424 * <code>srcPos+length-1</code> were first copied to a temporary
425 * array with <code>length</code> components and then the contents of
426 * the temporary array were copied into positions
427 * <code>destPos</code> through <code>destPos+length-1</code> of the
428 * destination array.
429 * <p>
430 * If <code>dest</code> is <code>null</code>, then a
431 * <code>NullPointerException</code> is thrown.
432 * <p>
433 * If <code>src</code> is <code>null</code>, then a
434 * <code>NullPointerException</code> is thrown and the destination
435 * array is not modified.
436 * <p>
437 * Otherwise, if any of the following is true, an
438 * <code>ArrayStoreException</code> is thrown and the destination is
439 * not modified:
440 * <ul>
441 * <li>The <code>src</code> argument refers to an object that is not an
442 * array.
443 * <li>The <code>dest</code> argument refers to an object that is not an
444 * array.
445 * <li>The <code>src</code> argument and <code>dest</code> argument refer
446 * to arrays whose component types are different primitive types.
447 * <li>The <code>src</code> argument refers to an array with a primitive
448 * component type and the <code>dest</code> argument refers to an array
449 * with a reference component type.
450 * <li>The <code>src</code> argument refers to an array with a reference
451 * component type and the <code>dest</code> argument refers to an array
452 * with a primitive component type.
453 * </ul>
454 * <p>
455 * Otherwise, if any of the following is true, an
456 * <code>IndexOutOfBoundsException</code> is
457 * thrown and the destination is not modified:
458 * <ul>
459 * <li>The <code>srcPos</code> argument is negative.
460 * <li>The <code>destPos</code> argument is negative.
461 * <li>The <code>length</code> argument is negative.
462 * <li><code>srcPos+length</code> is greater than
463 * <code>src.length</code>, the length of the source array.
464 * <li><code>destPos+length</code> is greater than
465 * <code>dest.length</code>, the length of the destination array.
466 * </ul>
467 * <p>
468 * Otherwise, if any actual component of the source array from
469 * position <code>srcPos</code> through
470 * <code>srcPos+length-1</code> cannot be converted to the component
471 * type of the destination array by assignment conversion, an
472 * <code>ArrayStoreException</code> is thrown. In this case, let
473 * <b><i>k</i></b> be the smallest nonnegative integer less than
474 * length such that <code>src[srcPos+</code><i>k</i><code>]</code>
475 * cannot be converted to the component type of the destination
476 * array; when the exception is thrown, source array components from
477 * positions <code>srcPos</code> through
478 * <code>srcPos+</code><i>k</i><code>-1</code>
479 * will already have been copied to destination array positions
480 * <code>destPos</code> through
481 * <code>destPos+</code><i>k</I><code>-1</code> and no other
482 * positions of the destination array will have been modified.
483 * (Because of the restrictions already itemized, this
484 * paragraph effectively applies only to the situation where both
485 * arrays have component types that are reference types.)
486 *
487 * @param src the source array.
488 * @param srcPos starting position in the source array.
489 * @param dest the destination array.
490 * @param destPos starting position in the destination data.
491 * @param length the number of array elements to be copied.
492 * @exception IndexOutOfBoundsException if copying would cause
493 * access of data outside array bounds.
494 * @exception ArrayStoreException if an element in the <code>src</code>
495 * array could not be stored into the <code>dest</code> array
496 * because of a type mismatch.
497 * @exception NullPointerException if either <code>src</code> or
498 * <code>dest</code> is <code>null</code>.
499 */
500 @HotSpotIntrinsicCandidate
501 public static native void arraycopy(Object src, int srcPos,
502 Object dest, int destPos,
503 int length);
504
505 /**
506 * Returns the same hash code for the given object as
507 * would be returned by the default method hashCode(),
508 * whether or not the given object's class overrides
509 * hashCode().
510 * The hash code for the null reference is zero.
511 *
512 * @param x object for which the hashCode is to be calculated
513 * @return the hashCode
514 * @since 1.1
515 */
516 @HotSpotIntrinsicCandidate
517 public static native int identityHashCode(Object x);
518
519 /**
520 * System properties. The following properties are guaranteed to be defined:
521 * <dl>
522 * <dt>java.version <dd>Java version number
523 * <dt>java.vendor <dd>Java vendor specific string
524 * <dt>java.vendor.url <dd>Java vendor URL
525 * <dt>java.home <dd>Java installation directory
526 * <dt>java.class.version <dd>Java class version number
527 * <dt>java.class.path <dd>Java classpath
528 * <dt>os.name <dd>Operating System Name
529 * <dt>os.arch <dd>Operating System Architecture
530 * <dt>os.version <dd>Operating System Version
531 * <dt>file.separator <dd>File separator ("/" on Unix)
532 * <dt>path.separator <dd>Path separator (":" on Unix)
533 * <dt>line.separator <dd>Line separator ("\n" on Unix)
534 * <dt>user.name <dd>User account name
535 * <dt>user.home <dd>User home directory
536 * <dt>user.dir <dd>User's current working directory
537 * </dl>
538 */
539
540 private static Properties props;
541 private static native Properties initProperties(Properties props);
542
543 /**
544 * Determines the current system properties.
545 * <p>
546 * First, if there is a security manager, its
547 * <code>checkPropertiesAccess</code> method is called with no
548 * arguments. This may result in a security exception.
549 * <p>
550 * The current set of system properties for use by the
551 * {@link #getProperty(String)} method is returned as a
552 * <code>Properties</code> object. If there is no current set of
553 * system properties, a set of system properties is first created and
554 * initialized. This set of system properties always includes values
555 * for the following keys:
556 * <table summary="Shows property keys and associated values">
557 * <tr><th>Key</th>
558 * <th>Description of Associated Value</th></tr>
559 * <tr><td><code>java.version</code></td>
560 * <td>Java Runtime Environment version</td></tr>
561 * <tr><td><code>java.vendor</code></td>
562 * <td>Java Runtime Environment vendor</td></tr>
563 * <tr><td><code>java.vendor.url</code></td>
564 * <td>Java vendor URL</td></tr>
565 * <tr><td><code>java.home</code></td>
566 * <td>Java installation directory</td></tr>
567 * <tr><td><code>java.vm.specification.version</code></td>
568 * <td>Java Virtual Machine specification version</td></tr>
569 * <tr><td><code>java.vm.specification.vendor</code></td>
570 * <td>Java Virtual Machine specification vendor</td></tr>
571 * <tr><td><code>java.vm.specification.name</code></td>
572 * <td>Java Virtual Machine specification name</td></tr>
573 * <tr><td><code>java.vm.version</code></td>
574 * <td>Java Virtual Machine implementation version</td></tr>
575 * <tr><td><code>java.vm.vendor</code></td>
576 * <td>Java Virtual Machine implementation vendor</td></tr>
577 * <tr><td><code>java.vm.name</code></td>
578 * <td>Java Virtual Machine implementation name</td></tr>
579 * <tr><td><code>java.specification.version</code></td>
580 * <td>Java Runtime Environment specification version</td></tr>
581 * <tr><td><code>java.specification.vendor</code></td>
582 * <td>Java Runtime Environment specification vendor</td></tr>
583 * <tr><td><code>java.specification.name</code></td>
584 * <td>Java Runtime Environment specification name</td></tr>
585 * <tr><td><code>java.class.version</code></td>
586 * <td>Java class format version number</td></tr>
587 * <tr><td><code>java.class.path</code></td>
588 * <td>Java class path</td></tr>
589 * <tr><td><code>java.library.path</code></td>
590 * <td>List of paths to search when loading libraries</td></tr>
591 * <tr><td><code>java.io.tmpdir</code></td>
592 * <td>Default temp file path</td></tr>
593 * <tr><td><code>java.compiler</code></td>
594 * <td>Name of JIT compiler to use</td></tr>
595 * <tr><td><code>os.name</code></td>
596 * <td>Operating system name</td></tr>
597 * <tr><td><code>os.arch</code></td>
598 * <td>Operating system architecture</td></tr>
599 * <tr><td><code>os.version</code></td>
600 * <td>Operating system version</td></tr>
601 * <tr><td><code>file.separator</code></td>
602 * <td>File separator ("/" on UNIX)</td></tr>
603 * <tr><td><code>path.separator</code></td>
604 * <td>Path separator (":" on UNIX)</td></tr>
605 * <tr><td><code>line.separator</code></td>
606 * <td>Line separator ("\n" on UNIX)</td></tr>
607 * <tr><td><code>user.name</code></td>
608 * <td>User's account name</td></tr>
609 * <tr><td><code>user.home</code></td>
610 * <td>User's home directory</td></tr>
611 * <tr><td><code>user.dir</code></td>
612 * <td>User's current working directory</td></tr>
613 * </table>
614 * <p>
615 * Multiple paths in a system property value are separated by the path
616 * separator character of the platform.
617 * <p>
618 * Note that even if the security manager does not permit the
619 * <code>getProperties</code> operation, it may choose to permit the
620 * {@link #getProperty(String)} operation.
621 *
622 * @return the system properties
623 * @exception SecurityException if a security manager exists and its
624 * <code>checkPropertiesAccess</code> method doesn't allow access
625 * to the system properties.
626 * @see #setProperties
627 * @see java.lang.SecurityException
628 * @see java.lang.SecurityManager#checkPropertiesAccess()
629 * @see java.util.Properties
630 */
631 public static Properties getProperties() {
632 SecurityManager sm = getSecurityManager();
633 if (sm != null) {
634 sm.checkPropertiesAccess();
635 }
636
637 return props;
638 }
639
640 /**
641 * Returns the system-dependent line separator string. It always
642 * returns the same value - the initial value of the {@linkplain
643 * #getProperty(String) system property} {@code line.separator}.
644 *
645 * <p>On UNIX systems, it returns {@code "\n"}; on Microsoft
646 * Windows systems it returns {@code "\r\n"}.
647 *
648 * @return the system-dependent line separator string
649 * @since 1.7
650 */
651 public static String lineSeparator() {
652 return lineSeparator;
653 }
654
655 private static String lineSeparator;
656
657 /**
658 * Sets the system properties to the <code>Properties</code>
659 * argument.
660 * <p>
661 * First, if there is a security manager, its
662 * <code>checkPropertiesAccess</code> method is called with no
663 * arguments. This may result in a security exception.
664 * <p>
665 * The argument becomes the current set of system properties for use
666 * by the {@link #getProperty(String)} method. If the argument is
667 * <code>null</code>, then the current set of system properties is
668 * forgotten.
669 *
670 * @param props the new system properties.
671 * @exception SecurityException if a security manager exists and its
672 * <code>checkPropertiesAccess</code> method doesn't allow access
673 * to the system properties.
674 * @see #getProperties
675 * @see java.util.Properties
676 * @see java.lang.SecurityException
677 * @see java.lang.SecurityManager#checkPropertiesAccess()
678 */
679 public static void setProperties(Properties props) {
680 SecurityManager sm = getSecurityManager();
681 if (sm != null) {
682 sm.checkPropertiesAccess();
683 }
684 if (props == null) {
685 props = new Properties();
686 initProperties(props);
687 }
688 System.props = props;
689 }
690
691 /**
692 * Gets the system property indicated by the specified key.
693 * <p>
694 * First, if there is a security manager, its
695 * <code>checkPropertyAccess</code> method is called with the key as
696 * its argument. This may result in a SecurityException.
697 * <p>
698 * If there is no current set of system properties, a set of system
699 * properties is first created and initialized in the same manner as
700 * for the <code>getProperties</code> method.
701 *
702 * @param key the name of the system property.
703 * @return the string value of the system property,
704 * or <code>null</code> if there is no property with that key.
705 *
706 * @exception SecurityException if a security manager exists and its
707 * <code>checkPropertyAccess</code> method doesn't allow
708 * access to the specified system property.
709 * @exception NullPointerException if <code>key</code> is
710 * <code>null</code>.
711 * @exception IllegalArgumentException if <code>key</code> is empty.
712 * @see #setProperty
713 * @see java.lang.SecurityException
714 * @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
715 * @see java.lang.System#getProperties()
716 */
717 public static String getProperty(String key) {
718 checkKey(key);
719 SecurityManager sm = getSecurityManager();
720 if (sm != null) {
721 sm.checkPropertyAccess(key);
722 }
723
724 return props.getProperty(key);
725 }
726
727 /**
728 * Gets the system property indicated by the specified key.
729 * <p>
730 * First, if there is a security manager, its
731 * <code>checkPropertyAccess</code> method is called with the
732 * <code>key</code> as its argument.
733 * <p>
734 * If there is no current set of system properties, a set of system
735 * properties is first created and initialized in the same manner as
736 * for the <code>getProperties</code> method.
737 *
738 * @param key the name of the system property.
739 * @param def a default value.
740 * @return the string value of the system property,
741 * or the default value if there is no property with that key.
742 *
743 * @exception SecurityException if a security manager exists and its
744 * <code>checkPropertyAccess</code> method doesn't allow
745 * access to the specified system property.
746 * @exception NullPointerException if <code>key</code> is
747 * <code>null</code>.
748 * @exception IllegalArgumentException if <code>key</code> is empty.
749 * @see #setProperty
750 * @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
751 * @see java.lang.System#getProperties()
752 */
753 public static String getProperty(String key, String def) {
754 checkKey(key);
755 SecurityManager sm = getSecurityManager();
756 if (sm != null) {
757 sm.checkPropertyAccess(key);
758 }
759
760 return props.getProperty(key, def);
761 }
762
763 /**
764 * Sets the system property indicated by the specified key.
765 * <p>
766 * First, if a security manager exists, its
767 * <code>SecurityManager.checkPermission</code> method
768 * is called with a <code>PropertyPermission(key, "write")</code>
769 * permission. This may result in a SecurityException being thrown.
770 * If no exception is thrown, the specified property is set to the given
771 * value.
772 *
773 * @param key the name of the system property.
774 * @param value the value of the system property.
775 * @return the previous value of the system property,
776 * or <code>null</code> if it did not have one.
777 *
778 * @exception SecurityException if a security manager exists and its
779 * <code>checkPermission</code> method doesn't allow
780 * setting of the specified property.
781 * @exception NullPointerException if <code>key</code> or
782 * <code>value</code> is <code>null</code>.
783 * @exception IllegalArgumentException if <code>key</code> is empty.
784 * @see #getProperty
785 * @see java.lang.System#getProperty(java.lang.String)
786 * @see java.lang.System#getProperty(java.lang.String, java.lang.String)
787 * @see java.util.PropertyPermission
788 * @see SecurityManager#checkPermission
789 * @since 1.2
790 */
791 public static String setProperty(String key, String value) {
792 checkKey(key);
793 SecurityManager sm = getSecurityManager();
794 if (sm != null) {
795 sm.checkPermission(new PropertyPermission(key,
796 SecurityConstants.PROPERTY_WRITE_ACTION));
797 }
798
799 return (String) props.setProperty(key, value);
800 }
801
802 /**
803 * Removes the system property indicated by the specified key.
804 * <p>
805 * First, if a security manager exists, its
806 * <code>SecurityManager.checkPermission</code> method
807 * is called with a <code>PropertyPermission(key, "write")</code>
808 * permission. This may result in a SecurityException being thrown.
809 * If no exception is thrown, the specified property is removed.
810 *
811 * @param key the name of the system property to be removed.
812 * @return the previous string value of the system property,
813 * or <code>null</code> if there was no property with that key.
814 *
815 * @exception SecurityException if a security manager exists and its
816 * <code>checkPropertyAccess</code> method doesn't allow
817 * access to the specified system property.
818 * @exception NullPointerException if <code>key</code> is
819 * <code>null</code>.
820 * @exception IllegalArgumentException if <code>key</code> is empty.
821 * @see #getProperty
822 * @see #setProperty
823 * @see java.util.Properties
824 * @see java.lang.SecurityException
825 * @see java.lang.SecurityManager#checkPropertiesAccess()
826 * @since 1.5
827 */
828 public static String clearProperty(String key) {
829 checkKey(key);
830 SecurityManager sm = getSecurityManager();
831 if (sm != null) {
832 sm.checkPermission(new PropertyPermission(key, "write"));
833 }
834
835 return (String) props.remove(key);
836 }
837
838 private static void checkKey(String key) {
839 if (key == null) {
840 throw new NullPointerException("key can't be null");
841 }
842 if (key.equals("")) {
843 throw new IllegalArgumentException("key can't be empty");
844 }
845 }
846
847 /**
848 * Gets the value of the specified environment variable. An
849 * environment variable is a system-dependent external named
850 * value.
851 *
852 * <p>If a security manager exists, its
853 * {@link SecurityManager#checkPermission checkPermission}
854 * method is called with a
855 * <code>{@link RuntimePermission}("getenv."+name)</code>
856 * permission. This may result in a {@link SecurityException}
857 * being thrown. If no exception is thrown the value of the
858 * variable <code>name</code> is returned.
859 *
860 * <p><a name="EnvironmentVSSystemProperties"><i>System
861 * properties</i> and <i>environment variables</i></a> are both
862 * conceptually mappings between names and values. Both
863 * mechanisms can be used to pass user-defined information to a
864 * Java process. Environment variables have a more global effect,
865 * because they are visible to all descendants of the process
866 * which defines them, not just the immediate Java subprocess.
867 * They can have subtly different semantics, such as case
868 * insensitivity, on different operating systems. For these
869 * reasons, environment variables are more likely to have
870 * unintended side effects. It is best to use system properties
871 * where possible. Environment variables should be used when a
872 * global effect is desired, or when an external system interface
873 * requires an environment variable (such as <code>PATH</code>).
874 *
875 * <p>On UNIX systems the alphabetic case of <code>name</code> is
876 * typically significant, while on Microsoft Windows systems it is
877 * typically not. For example, the expression
878 * <code>System.getenv("FOO").equals(System.getenv("foo"))</code>
879 * is likely to be true on Microsoft Windows.
880 *
881 * @param name the name of the environment variable
882 * @return the string value of the variable, or <code>null</code>
883 * if the variable is not defined in the system environment
884 * @throws NullPointerException if <code>name</code> is <code>null</code>
885 * @throws SecurityException
886 * if a security manager exists and its
887 * {@link SecurityManager#checkPermission checkPermission}
888 * method doesn't allow access to the environment variable
889 * <code>name</code>
890 * @see #getenv()
891 * @see ProcessBuilder#environment()
892 */
893 public static String getenv(String name) {
894 SecurityManager sm = getSecurityManager();
895 if (sm != null) {
896 sm.checkPermission(new RuntimePermission("getenv."+name));
897 }
898
899 return ProcessEnvironment.getenv(name);
900 }
901
902
903 /**
904 * Returns an unmodifiable string map view of the current system environment.
905 * The environment is a system-dependent mapping from names to
906 * values which is passed from parent to child processes.
907 *
908 * <p>If the system does not support environment variables, an
909 * empty map is returned.
910 *
911 * <p>The returned map will never contain null keys or values.
912 * Attempting to query the presence of a null key or value will
913 * throw a {@link NullPointerException}. Attempting to query
914 * the presence of a key or value which is not of type
915 * {@link String} will throw a {@link ClassCastException}.
916 *
917 * <p>The returned map and its collection views may not obey the
918 * general contract of the {@link Object#equals} and
919 * {@link Object#hashCode} methods.
920 *
921 * <p>The returned map is typically case-sensitive on all platforms.
922 *
923 * <p>If a security manager exists, its
924 * {@link SecurityManager#checkPermission checkPermission}
925 * method is called with a
926 * <code>{@link RuntimePermission}("getenv.*")</code>
927 * permission. This may result in a {@link SecurityException} being
928 * thrown.
929 *
930 * <p>When passing information to a Java subprocess,
931 * <a href=#EnvironmentVSSystemProperties>system properties</a>
932 * are generally preferred over environment variables.
933 *
934 * @return the environment as a map of variable names to values
935 * @throws SecurityException
936 * if a security manager exists and its
937 * {@link SecurityManager#checkPermission checkPermission}
938 * method doesn't allow access to the process environment
939 * @see #getenv(String)
940 * @see ProcessBuilder#environment()
941 * @since 1.5
942 */
943 public static java.util.Map<String,String> getenv() {
944 SecurityManager sm = getSecurityManager();
945 if (sm != null) {
946 sm.checkPermission(new RuntimePermission("getenv.*"));
947 }
948
949 return ProcessEnvironment.getenv();
950 }
951
952 /**
953 * {@code System.Logger} instances log messages that will be
954 * routed to the underlying logging framework the {@link System.LoggerFinder
955 * LoggerFinder} uses.
956 * <p>
957 * {@code System.Logger} instances are typically obtained from
958 * the {@link java.lang.System System} class, by calling
959 * {@link java.lang.System#getLogger(java.lang.String) System.getLogger(loggerName)}
960 * or {@link java.lang.System#getLogger(java.lang.String, java.util.ResourceBundle)
961 * System.getLogger(loggerName, bundle)}.
962 *
963 * @see java.lang.System#getLogger(java.lang.String)
964 * @see java.lang.System#getLogger(java.lang.String, java.util.ResourceBundle)
965 * @see java.lang.System.LoggerFinder
966 *
967 * @since 9
968 *
969 */
970 public interface Logger {
971
972 /**
973 * System {@linkplain Logger loggers} levels.
974 * <p>
975 * A level has a {@linkplain #getName() name} and {@linkplain
976 * #getSeverity() severity}.
977 * Level values are {@link #ALL}, {@link #TRACE}, {@link #DEBUG},
978 * {@link #INFO}, {@link #WARNING}, {@link #ERROR}, {@link #OFF},
979 * by order of increasing severity.
980 * <br>
981 * {@link #ALL} and {@link #OFF}
982 * are simple markers with severities mapped respectively to
983 * {@link java.lang.Integer#MIN_VALUE Integer.MIN_VALUE} and
984 * {@link java.lang.Integer#MAX_VALUE Integer.MAX_VALUE}.
985 * <p>
986 * <b>Severity values and Mapping to {@code java.util.logging.Level}.</b>
987 * <p>
988 * {@linkplain System.Logger.Level System logger levels} are mapped to
989 * {@linkplain java.util.logging.Level java.util.logging levels}
990 * of corresponding severity.
991 * <br>The mapping is as follows:
992 * <br><br>
993 * <table border="1">
994 * <caption>System.Logger Severity Level Mapping</caption>
995 * <tr><td><b>System.Logger Levels</b></td>
996 * <td>{@link Logger.Level#ALL ALL}</td>
997 * <td>{@link Logger.Level#TRACE TRACE}</td>
998 * <td>{@link Logger.Level#DEBUG DEBUG}</td>
999 * <td>{@link Logger.Level#INFO INFO}</td>
1000 * <td>{@link Logger.Level#WARNING WARNING}</td>
1001 * <td>{@link Logger.Level#ERROR ERROR}</td>
1002 * <td>{@link Logger.Level#OFF OFF}</td>
1003 * </tr>
1004 * <tr><td><b>java.util.logging Levels</b></td>
1005 * <td>{@link java.util.logging.Level#ALL ALL}</td>
1006 * <td>{@link java.util.logging.Level#FINER FINER}</td>
1007 * <td>{@link java.util.logging.Level#FINE FINE}</td>
1008 * <td>{@link java.util.logging.Level#INFO INFO}</td>
1009 * <td>{@link java.util.logging.Level#WARNING WARNING}</td>
1010 * <td>{@link java.util.logging.Level#SEVERE SEVERE}</td>
1011 * <td>{@link java.util.logging.Level#OFF OFF}</td>
1012 * </tr>
1013 * </table>
1014 *
1015 * @since 9
1016 *
1017 * @see java.lang.System.LoggerFinder
1018 * @see java.lang.System.Logger
1019 */
1020 public enum Level {
1021
1022 // for convenience, we're reusing java.util.logging.Level int values
1023 // the mapping logic in sun.util.logging.PlatformLogger depends
1024 // on this.
1025 /**
1026 * A marker to indicate that all levels are enabled.
1027 * This level {@linkplain #getSeverity() severity} is
1028 * {@link Integer#MIN_VALUE}.
1029 */
1030 ALL(Integer.MIN_VALUE), // typically mapped to/from j.u.l.Level.ALL
1031 /**
1032 * {@code TRACE} level: usually used to log diagnostic information.
1033 * This level {@linkplain #getSeverity() severity} is
1034 * {@code 400}.
1035 */
1036 TRACE(400), // typically mapped to/from j.u.l.Level.FINER
1037 /**
1038 * {@code DEBUG} level: usually used to log debug information traces.
1039 * This level {@linkplain #getSeverity() severity} is
1040 * {@code 500}.
1041 */
1042 DEBUG(500), // typically mapped to/from j.u.l.Level.FINEST/FINE/CONFIG
1043 /**
1044 * {@code INFO} level: usually used to log information messages.
1045 * This level {@linkplain #getSeverity() severity} is
1046 * {@code 800}.
1047 */
1048 INFO(800), // typically mapped to/from j.u.l.Level.INFO
1049 /**
1050 * {@code WARNING} level: usually used to log warning messages.
1051 * This level {@linkplain #getSeverity() severity} is
1052 * {@code 900}.
1053 */
1054 WARNING(900), // typically mapped to/from j.u.l.Level.WARNING
1055 /**
1056 * {@code ERROR} level: usually used to log error messages.
1057 * This level {@linkplain #getSeverity() severity} is
1058 * {@code 1000}.
1059 */
1060 ERROR(1000), // typically mapped to/from j.u.l.Level.SEVERE
1061 /**
1062 * A marker to indicate that all levels are disabled.
1063 * This level {@linkplain #getSeverity() severity} is
1064 * {@link Integer#MAX_VALUE}.
1065 */
1066 OFF(Integer.MAX_VALUE); // typically mapped to/from j.u.l.Level.OFF
1067
1068 private final int severity;
1069
1070 private Level(int severity) {
1071 this.severity = severity;
1072 }
1073
1074 /**
1075 * Returns the name of this level.
1076 * @return this level {@linkplain #name()}.
1077 */
1078 public final String getName() {
1079 return name();
1080 }
1081
1082 /**
1083 * Returns the severity of this level.
1084 * A higher severity means a more severe condition.
1085 * @return this level severity.
1086 */
1087 public final int getSeverity() {
1088 return severity;
1089 }
1090 }
1091
1092 /**
1093 * Returns the name of this logger.
1094 *
1095 * @return the logger name.
1096 */
1097 public String getName();
1098
1099 /**
1100 * Checks if a message of the given level would be logged by
1101 * this logger.
1102 *
1103 * @param level the log message level.
1104 * @return {@code true} if the given log message level is currently
1105 * being logged.
1106 *
1107 * @throws NullPointerException if {@code level} is {@code null}.
1108 */
1109 public boolean isLoggable(Level level);
1110
1111 /**
1112 * Logs a message.
1113 *
1114 * @implSpec The default implementation for this method calls
1115 * {@code this.log(level, (ResourceBundle)null, msg, (Object[])null);}
1116 *
1117 * @param level the log message level.
1118 * @param msg the string message (or a key in the message catalog, if
1119 * this logger is a {@link
1120 * LoggerFinder#getLocalizedLogger(java.lang.String, java.util.ResourceBundle, java.lang.Class)
1121 * localized logger}); can be {@code null}.
1122 *
1123 * @throws NullPointerException if {@code level} is {@code null}.
1124 */
1125 public default void log(Level level, String msg) {
1126 log(level, (ResourceBundle) null, msg, (Object[]) null);
1127 }
1128
1129 /**
1130 * Logs a lazily supplied message.
1131 * <p>
1132 * If the logger is currently enabled for the given log message level
1133 * then a message is logged that is the result produced by the
1134 * given supplier function. Otherwise, the supplier is not operated on.
1135 *
1136 * @implSpec When logging is enabled for the given level, the default
1137 * implementation for this method calls
1138 * {@code this.log(level, (ResourceBundle)null, msgSupplier.get(), (Object[])null);}
1139 *
1140 * @param level the log message level.
1141 * @param msgSupplier a supplier function that produces a message.
1142 *
1143 * @throws NullPointerException if {@code level} is {@code null},
1144 * or {@code msgSupplier} is {@code null}.
1145 */
1146 public default void log(Level level, Supplier<String> msgSupplier) {
1147 Objects.requireNonNull(msgSupplier);
1148 if (isLoggable(Objects.requireNonNull(level))) {
1149 log(level, (ResourceBundle) null, msgSupplier.get(), (Object[]) null);
1150 }
1151 }
1152
1153 /**
1154 * Logs a message produced from the given object.
1155 * <p>
1156 * If the logger is currently enabled for the given log message level then
1157 * a message is logged that, by default, is the result produced from
1158 * calling toString on the given object.
1159 * Otherwise, the object is not operated on.
1160 *
1161 * @implSpec When logging is enabled for the given level, the default
1162 * implementation for this method calls
1163 * {@code this.log(level, (ResourceBundle)null, obj.toString(), (Object[])null);}
1164 *
1165 * @param level the log message level.
1166 * @param obj the object to log.
1167 *
1168 * @throws NullPointerException if {@code level} is {@code null}, or
1169 * {@code obj} is {@code null}.
1170 */
1171 public default void log(Level level, Object obj) {
1172 Objects.requireNonNull(obj);
1173 if (isLoggable(Objects.requireNonNull(level))) {
1174 this.log(level, (ResourceBundle) null, obj.toString(), (Object[]) null);
1175 }
1176 }
1177
1178 /**
1179 * Logs a message associated with a given throwable.
1180 *
1181 * @implSpec The default implementation for this method calls
1182 * {@code this.log(level, (ResourceBundle)null, msg, thrown);}
1183 *
1184 * @param level the log message level.
1185 * @param msg the string message (or a key in the message catalog, if
1186 * this logger is a {@link
1187 * LoggerFinder#getLocalizedLogger(java.lang.String, java.util.ResourceBundle, java.lang.Class)
1188 * localized logger}); can be {@code null}.
1189 * @param thrown a {@code Throwable} associated with the log message;
1190 * can be {@code null}.
1191 *
1192 * @throws NullPointerException if {@code level} is {@code null}.
1193 */
1194 public default void log(Level level, String msg, Throwable thrown) {
1195 this.log(level, null, msg, thrown);
1196 }
1197
1198 /**
1199 * Logs a lazily supplied message associated with a given throwable.
1200 * <p>
1201 * If the logger is currently enabled for the given log message level
1202 * then a message is logged that is the result produced by the
1203 * given supplier function. Otherwise, the supplier is not operated on.
1204 *
1205 * @implSpec When logging is enabled for the given level, the default
1206 * implementation for this method calls
1207 * {@code this.log(level, (ResourceBundle)null, msgSupplier.get(), thrown);}
1208 *
1209 * @param level one of the log message level identifiers.
1210 * @param msgSupplier a supplier function that produces a message.
1211 * @param thrown a {@code Throwable} associated with log message;
1212 * can be {@code null}.
1213 *
1214 * @throws NullPointerException if {@code level} is {@code null}, or
1215 * {@code msgSupplier} is {@code null}.
1216 */
1217 public default void log(Level level, Supplier<String> msgSupplier,
1218 Throwable thrown) {
1219 Objects.requireNonNull(msgSupplier);
1220 if (isLoggable(Objects.requireNonNull(level))) {
1221 this.log(level, null, msgSupplier.get(), thrown);
1222 }
1223 }
1224
1225 /**
1226 * Logs a message with an optional list of parameters.
1227 *
1228 * @implSpec The default implementation for this method calls
1229 * {@code this.log(level, (ResourceBundle)null, format, params);}
1230 *
1231 * @param level one of the log message level identifiers.
1232 * @param format the string message format in {@link
1233 * java.text.MessageFormat} format, (or a key in the message
1234 * catalog, if this logger is a {@link
1235 * LoggerFinder#getLocalizedLogger(java.lang.String, java.util.ResourceBundle, java.lang.Class)
1236 * localized logger}); can be {@code null}.
1237 * @param params an optional list of parameters to the message (may be
1238 * none).
1239 *
1240 * @throws NullPointerException if {@code level} is {@code null}.
1241 */
1242 public default void log(Level level, String format, Object... params) {
1243 this.log(level, null, format, params);
1244 }
1245
1246 /**
1247 * Logs a localized message associated with a given throwable.
1248 * <p>
1249 * If the given resource bundle is non-{@code null}, the {@code msg}
1250 * string is localized using the given resource bundle.
1251 * Otherwise the {@code msg} string is not localized.
1252 *
1253 * @param level the log message level.
1254 * @param bundle a resource bundle to localize {@code msg}; can be
1255 * {@code null}.
1256 * @param msg the string message (or a key in the message catalog,
1257 * if {@code bundle} is not {@code null}); can be {@code null}.
1258 * @param thrown a {@code Throwable} associated with the log message;
1259 * can be {@code null}.
1260 *
1261 * @throws NullPointerException if {@code level} is {@code null}.
1262 */
1263 public void log(Level level, ResourceBundle bundle, String msg,
1264 Throwable thrown);
1265
1266 /**
1267 * Logs a message with resource bundle and an optional list of
1268 * parameters.
1269 * <p>
1270 * If the given resource bundle is non-{@code null}, the {@code format}
1271 * string is localized using the given resource bundle.
1272 * Otherwise the {@code format} string is not localized.
1273 *
1274 * @param level the log message level.
1275 * @param bundle a resource bundle to localize {@code format}; can be
1276 * {@code null}.
1277 * @param format the string message format in {@link
1278 * java.text.MessageFormat} format, (or a key in the message
1279 * catalog if {@code bundle} is not {@code null}); can be {@code null}.
1280 * @param params an optional list of parameters to the message (may be
1281 * none).
1282 *
1283 * @throws NullPointerException if {@code level} is {@code null}.
1284 */
1285 public void log(Level level, ResourceBundle bundle, String format,
1286 Object... params);
1287
1288
1289 }
1290
1291 /**
1292 * The {@code LoggerFinder} service is responsible for creating, managing,
1293 * and configuring loggers to the underlying framework it uses.
1294 * <p>
1295 * A logger finder is a concrete implementation of this class that has a
1296 * zero-argument constructor and implements the abstract methods defined
1297 * by this class.
1298 * The loggers returned from a logger finder are capable of routing log
1299 * messages to the logging backend this provider supports.
1300 * A given invocation of the Java Runtime maintains a single
1301 * system-wide LoggerFinder instance that is loaded as follows:
1302 * <ul>
1303 * <li>First it finds any custom {@code LoggerFinder} provider
1304 * using the {@link java.util.ServiceLoader} facility with the
1305 * {@linkplain ClassLoader#getSystemClassLoader() system class
1306 * loader}.</li>
1307 * <li>If no {@code LoggerFinder} provider is found, the system default
1308 * {@code LoggerFinder} implementation will be used.</li>
1309 * </ul>
1310 * <p>
1311 * An application can replace the logging backend
1312 * <i>even when the java.logging module is present</i>, by simply providing
1313 * and declaring an implementation of the {@link LoggerFinder} service.
1314 * <p>
1315 * <b>Default Implementation</b>
1316 * <p>
1317 * The system default {@code LoggerFinder} implementation uses
1318 * {@code java.util.logging} as the backend framework when the
1319 * {@code java.logging} module is present.
1320 * It returns a {@linkplain System.Logger logger} instance
1321 * that will route log messages to a {@link java.util.logging.Logger
1322 * java.util.logging.Logger}. Otherwise, if {@code java.logging} is not
1323 * present, the default implementation will return a simple logger
1324 * instance that will route log messages of {@code INFO} level and above to
1325 * the console ({@code System.err}).
1326 * <p>
1327 * <b>Logging Configuration</b>
1328 * <p>
1329 * {@linkplain Logger Logger} instances obtained from the
1330 * {@code LoggerFinder} factory methods are not directly configurable by
1331 * the application. Configuration is the responsibility of the underlying
1332 * logging backend, and usually requires using APIs specific to that backend.
1333 * <p>For the default {@code LoggerFinder} implementation
1334 * using {@code java.util.logging} as its backend, refer to
1335 * {@link java.util.logging java.util.logging} for logging configuration.
1336 * For the default {@code LoggerFinder} implementation returning simple loggers
1337 * when the {@code java.logging} module is absent, the configuration
1338 * is implementation dependent.
1339 * <p>
1340 * Usually an application that uses a logging framework will log messages
1341 * through a logger facade defined (or supported) by that framework.
1342 * Applications that wish to use an external framework should log
1343 * through the facade associated with that framework.
1344 * <p>
1345 * A system class that needs to log messages will typically obtain
1346 * a {@link System.Logger} instance to route messages to the logging
1347 * framework selected by the application.
1348 * <p>
1349 * Libraries and classes that only need loggers to produce log messages
1350 * should not attempt to configure loggers by themselves, as that
1351 * would make them dependent from a specific implementation of the
1352 * {@code LoggerFinder} service.
1353 * <p>
1354 * In addition, when a security manager is present, loggers provided to
1355 * system classes should not be directly configurable through the logging
1356 * backend without requiring permissions.
1357 * <br>
1358 * It is the responsibility of the provider of
1359 * the concrete {@code LoggerFinder} implementation to ensure that
1360 * these loggers are not configured by untrusted code without proper
1361 * permission checks, as configuration performed on such loggers usually
1362 * affects all applications in the same Java Runtime.
1363 * <p>
1364 * <b>Message Levels and Mapping to backend levels</b>
1365 * <p>
1366 * A logger finder is responsible for mapping from a {@code
1367 * System.Logger.Level} to a level supported by the logging backend it uses.
1368 * <br>The default LoggerFinder using {@code java.util.logging} as the backend
1369 * maps {@code System.Logger} levels to
1370 * {@linkplain java.util.logging.Level java.util.logging} levels
1371 * of corresponding severity - as described in {@link Logger.Level
1372 * Logger.Level}.
1373 *
1374 * @see java.lang.System
1375 * @see java.lang.System.Logger
1376 *
1377 * @since 9
1378 */
1379 public static abstract class LoggerFinder {
1380 /**
1381 * The {@code RuntimePermission("loggerFinder")} is
1382 * necessary to subclass and instantiate the {@code LoggerFinder} class,
1383 * as well as to obtain loggers from an instance of that class.
1384 */
1385 static final RuntimePermission LOGGERFINDER_PERMISSION =
1386 new RuntimePermission("loggerFinder");
1387
1388 /**
1389 * Creates a new instance of {@code LoggerFinder}.
1390 *
1391 * @implNote It is recommended that a {@code LoggerFinder} service
1392 * implementation does not perform any heavy initialization in its
1393 * constructor, in order to avoid possible risks of deadlock or class
1394 * loading cycles during the instantiation of the service provider.
1395 *
1396 * @throws SecurityException if a security manager is present and its
1397 * {@code checkPermission} method doesn't allow the
1398 * {@code RuntimePermission("loggerFinder")}.
1399 */
1400 protected LoggerFinder() {
1401 this(checkPermission());
1402 }
1403
1404 private LoggerFinder(Void unused) {
1405 // nothing to do.
1406 }
1407
1408 private static Void checkPermission() {
1409 final SecurityManager sm = System.getSecurityManager();
1410 if (sm != null) {
1411 sm.checkPermission(LOGGERFINDER_PERMISSION);
1412 }
1413 return null;
1414 }
1415
1416 /**
1417 * Returns an instance of {@link Logger Logger}
1418 * for the given {@code caller}.
1419 *
1420 * @param name the name of the logger.
1421 * @param caller the class for which the logger is being requested;
1422 * can be {@code null}.
1423 *
1424 * @return a {@link Logger logger} suitable for the given caller's
1425 * use.
1426 * @throws NullPointerException if {@code name} is {@code null} or
1427 * {@code caller} is {@code null}.
1428 * @throws SecurityException if a security manager is present and its
1429 * {@code checkPermission} method doesn't allow the
1430 * {@code RuntimePermission("loggerFinder")}.
1431 */
1432 public abstract Logger getLogger(String name, /* Module */ Class<?> caller);
1433
1434 /**
1435 * Returns a localizable instance of {@link Logger Logger}
1436 * for the given {@code caller}.
1437 * The returned logger will use the provided resource bundle for
1438 * message localization.
1439 *
1440 * @implSpec By default, this method calls {@link
1441 * #getLogger(java.lang.String, java.lang.Class)
1442 * this.getLogger(name, caller)} to obtain a logger, then wraps that
1443 * logger in a {@link Logger} instance where all methods that do not
1444 * take a {@link ResourceBundle} as parameter are redirected to one
1445 * which does - passing the given {@code bundle} for
1446 * localization. So for instance, a call to {@link
1447 * Logger#log(Level, String) Logger.log(Level.INFO, msg)}
1448 * will end up as a call to {@link
1449 * Logger#log(Level, ResourceBundle, String, Object...)
1450 * Logger.log(Level.INFO, bundle, msg, (Object[])null)} on the wrapped
1451 * logger instance.
1452 * Note however that by default, string messages returned by {@link
1453 * java.util.function.Supplier Supplier<String>} will not be
1454 * localized, as it is assumed that such strings are messages which are
1455 * already constructed, rather than keys in a resource bundle.
1456 * <p>
1457 * An implementation of {@code LoggerFinder} may override this method,
1458 * for example, when the underlying logging backend provides its own
1459 * mechanism for localizing log messages, then such a
1460 * {@code LoggerFinder} would be free to return a logger
1461 * that makes direct use of the mechanism provided by the backend.
1462 *
1463 * @param name the name of the logger.
1464 * @param bundle a resource bundle; can be {@code null}.
1465 * @param caller the class for which the logger is being requested.
1466 * @return an instance of {@link Logger Logger} which will use the
1467 * provided resource bundle for message localization.
1468 *
1469 * @throws NullPointerException if {@code name} is {@code null} or
1470 * {@code caller} is {@code null}.
1471 * @throws SecurityException if a security manager is present and its
1472 * {@code checkPermission} method doesn't allow the
1473 * {@code RuntimePermission("loggerFinder")}.
1474 */
1475 public Logger getLocalizedLogger(String name, ResourceBundle bundle,
1476 /* Module */ Class<?> caller) {
1477 return new LocalizedLoggerWrapper<>(getLogger(name, caller), bundle);
1478 }
1479
1480 /**
1481 * Returns the {@code LoggerFinder} instance. There is one
1482 * single system-wide {@code LoggerFinder} instance in
1483 * the Java Runtime. See the class specification of how the
1484 * {@link LoggerFinder LoggerFinder} implementation is located and
1485 * loaded.
1486
1487 * @return the {@link LoggerFinder LoggerFinder} instance.
1488 * @throws SecurityException if a security manager is present and its
1489 * {@code checkPermission} method doesn't allow the
1490 * {@code RuntimePermission("loggerFinder")}.
1491 */
1492 public static LoggerFinder getLoggerFinder() {
1493 final SecurityManager sm = System.getSecurityManager();
1494 if (sm != null) {
1495 sm.checkPermission(LOGGERFINDER_PERMISSION);
1496 }
1497 return accessProvider();
1498 }
1499
1500
1501 private static volatile LoggerFinder service;
1502 static LoggerFinder accessProvider() {
1503 // We do not need to synchronize: LoggerFinderLoader will
1504 // always return the same instance, so if we don't have it,
1505 // just fetch it again.
1506 if (service == null) {
1507 PrivilegedAction<LoggerFinder> pa =
1508 () -> LoggerFinderLoader.getLoggerFinder();
1509 service = AccessController.doPrivileged(pa, null,
1510 LOGGERFINDER_PERMISSION);
1511 }
1512 return service;
1513 }
1514
1515 }
1516
1517
1518 /**
1519 * Returns an instance of {@link Logger Logger} for the caller's
1520 * use.
1521 *
1522 * @implSpec
1523 * Instances returned by this method route messages to loggers
1524 * obtained by calling {@link LoggerFinder#getLogger(java.lang.String, java.lang.Class)
1525 * LoggerFinder.getLogger(name, caller)}.
1526 *
1527 * @apiNote
1528 * This method may defer calling the {@link
1529 * LoggerFinder#getLogger(java.lang.String, java.lang.Class)
1530 * LoggerFinder.getLogger} method to create an actual logger supplied by
1531 * the logging backend, for instance, to allow loggers to be obtained during
1532 * the system initialization time.
1533 *
1534 * @param name the name of the logger.
1535 * @return an instance of {@link Logger} that can be used by the calling
1536 * class.
1537 * @throws NullPointerException if {@code name} is {@code null}.
1538 *
1539 * @since 9
1540 */
1541 @CallerSensitive
1542 public static Logger getLogger(String name) {
1543 Objects.requireNonNull(name);
1544 final Class<?> caller = Reflection.getCallerClass();
1545 return LazyLoggers.getLogger(name, caller);
1546 }
1547
1548 /**
1549 * Returns a localizable instance of {@link Logger
1550 * Logger} for the caller's use.
1551 * The returned logger will use the provided resource bundle for message
1552 * localization.
1553 *
1554 * @implSpec
1555 * The returned logger will perform message localization as specified
1556 * by {@link LoggerFinder#getLocalizedLogger(java.lang.String,
1557 * java.util.ResourceBundle, java.lang.Class)
1558 * LoggerFinder.getLocalizedLogger(name, bundle, caller}.
1559 *
1560 * @apiNote
1561 * This method is intended to be used after the system is fully initialized.
1562 * This method may trigger the immediate loading and initialization
1563 * of the {@link LoggerFinder} service, which may cause issues if the
1564 * Java Runtime is not ready to initialize the concrete service
1565 * implementation yet.
1566 * System classes which may be loaded early in the boot sequence and
1567 * need to log localized messages should create a logger using
1568 * {@link #getLogger(java.lang.String)} and then use the log methods that
1569 * take a resource bundle as parameter.
1570 *
1571 * @param name the name of the logger.
1572 * @param bundle a resource bundle.
1573 * @return an instance of {@link Logger} which will use the provided
1574 * resource bundle for message localization.
1575 * @throws NullPointerException if {@code name} is {@code null} or
1576 * {@code bundle} is {@code null}.
1577 *
1578 * @since 9
1579 */
1580 @CallerSensitive
1581 public static Logger getLogger(String name, ResourceBundle bundle) {
1582 final ResourceBundle rb = Objects.requireNonNull(bundle);
1583 Objects.requireNonNull(name);
1584 final Class<?> caller = Reflection.getCallerClass();
1585 final SecurityManager sm = System.getSecurityManager();
1586 // We don't use LazyLoggers if a resource bundle is specified.
1587 // Bootstrap sensitive classes in the JDK do not use resource bundles
1588 // when logging. This could be revisited later, if it needs to.
1589 if (sm != null) {
1590 return AccessController.doPrivileged((PrivilegedAction<Logger>)
1591 () -> LoggerFinder.accessProvider().getLocalizedLogger(name, rb, caller),
1592 null,
1593 LoggerFinder.LOGGERFINDER_PERMISSION);
1594 }
1595 return LoggerFinder.accessProvider().getLocalizedLogger(name, rb, caller);
1596 }
1597
1598 /**
1599 * Terminates the currently running Java Virtual Machine. The
1600 * argument serves as a status code; by convention, a nonzero status
1601 * code indicates abnormal termination.
1602 * <p>
1603 * This method calls the <code>exit</code> method in class
1604 * <code>Runtime</code>. This method never returns normally.
1605 * <p>
1606 * The call <code>System.exit(n)</code> is effectively equivalent to
1607 * the call:
1608 * <blockquote><pre>
1609 * Runtime.getRuntime().exit(n)
1610 * </pre></blockquote>
1611 *
1612 * @param status exit status.
1613 * @throws SecurityException
1614 * if a security manager exists and its <code>checkExit</code>
1615 * method doesn't allow exit with the specified status.
1616 * @see java.lang.Runtime#exit(int)
1617 */
1618 public static void exit(int status) {
1619 Runtime.getRuntime().exit(status);
1620 }
1621
1622 /**
1623 * Runs the garbage collector.
1624 * <p>
1625 * Calling the <code>gc</code> method suggests that the Java Virtual
1626 * Machine expend effort toward recycling unused objects in order to
1627 * make the memory they currently occupy available for quick reuse.
1628 * When control returns from the method call, the Java Virtual
1629 * Machine has made a best effort to reclaim space from all discarded
1630 * objects.
1631 * <p>
1632 * The call <code>System.gc()</code> is effectively equivalent to the
1633 * call:
1634 * <blockquote><pre>
1635 * Runtime.getRuntime().gc()
1636 * </pre></blockquote>
1637 *
1638 * @see java.lang.Runtime#gc()
1639 */
1640 public static void gc() {
1641 Runtime.getRuntime().gc();
1642 }
1643
1644 /**
1645 * Runs the finalization methods of any objects pending finalization.
1646 * <p>
1647 * Calling this method suggests that the Java Virtual Machine expend
1648 * effort toward running the <code>finalize</code> methods of objects
1649 * that have been found to be discarded but whose <code>finalize</code>
1650 * methods have not yet been run. When control returns from the
1651 * method call, the Java Virtual Machine has made a best effort to
1652 * complete all outstanding finalizations.
1653 * <p>
1654 * The call <code>System.runFinalization()</code> is effectively
1655 * equivalent to the call:
1656 * <blockquote><pre>
1657 * Runtime.getRuntime().runFinalization()
1658 * </pre></blockquote>
1659 *
1660 * @see java.lang.Runtime#runFinalization()
1661 */
1662 public static void runFinalization() {
1663 Runtime.getRuntime().runFinalization();
1664 }
1665
1666 /**
1667 * Enable or disable finalization on exit; doing so specifies that the
1668 * finalizers of all objects that have finalizers that have not yet been
1669 * automatically invoked are to be run before the Java runtime exits.
1670 * By default, finalization on exit is disabled.
1671 *
1672 * <p>If there is a security manager,
1673 * its <code>checkExit</code> method is first called
1674 * with 0 as its argument to ensure the exit is allowed.
1675 * This could result in a SecurityException.
1676 *
1677 * @deprecated This method is inherently unsafe. It may result in
1678 * finalizers being called on live objects while other threads are
1679 * concurrently manipulating those objects, resulting in erratic
1680 * behavior or deadlock.
1681 * @param value indicating enabling or disabling of finalization
1682 * @throws SecurityException
1683 * if a security manager exists and its <code>checkExit</code>
1684 * method doesn't allow the exit.
1685 *
1686 * @see java.lang.Runtime#exit(int)
1687 * @see java.lang.Runtime#gc()
1688 * @see java.lang.SecurityManager#checkExit(int)
1689 * @since 1.1
1690 */
1691 @Deprecated
1692 public static void runFinalizersOnExit(boolean value) {
1693 Runtime.runFinalizersOnExit(value);
1694 }
1695
1696 /**
1697 * Loads the native library specified by the filename argument. The filename
1698 * argument must be an absolute path name.
1699 *
1700 * If the filename argument, when stripped of any platform-specific library
1701 * prefix, path, and file extension, indicates a library whose name is,
1702 * for example, L, and a native library called L is statically linked
1703 * with the VM, then the JNI_OnLoad_L function exported by the library
1704 * is invoked rather than attempting to load a dynamic library.
1705 * A filename matching the argument does not have to exist in the
1706 * file system.
1707 * See the JNI Specification for more details.
1708 *
1709 * Otherwise, the filename argument is mapped to a native library image in
1710 * an implementation-dependent manner.
1711 *
1712 * <p>
1713 * The call <code>System.load(name)</code> is effectively equivalent
1714 * to the call:
1715 * <blockquote><pre>
1716 * Runtime.getRuntime().load(name)
1717 * </pre></blockquote>
1718 *
1719 * @param filename the file to load.
1720 * @exception SecurityException if a security manager exists and its
1721 * <code>checkLink</code> method doesn't allow
1722 * loading of the specified dynamic library
1723 * @exception UnsatisfiedLinkError if either the filename is not an
1724 * absolute path name, the native library is not statically
1725 * linked with the VM, or the library cannot be mapped to
1726 * a native library image by the host system.
1727 * @exception NullPointerException if <code>filename</code> is
1728 * <code>null</code>
1729 * @see java.lang.Runtime#load(java.lang.String)
1730 * @see java.lang.SecurityManager#checkLink(java.lang.String)
1731 */
1732 @CallerSensitive
1733 public static void load(String filename) {
1734 Runtime.getRuntime().load0(Reflection.getCallerClass(), filename);
1735 }
1736
1737 /**
1738 * Loads the native library specified by the <code>libname</code>
1739 * argument. The <code>libname</code> argument must not contain any platform
1740 * specific prefix, file extension or path. If a native library
1741 * called <code>libname</code> is statically linked with the VM, then the
1742 * JNI_OnLoad_<code>libname</code> function exported by the library is invoked.
1743 * See the JNI Specification for more details.
1744 *
1745 * Otherwise, the libname argument is loaded from a system library
1746 * location and mapped to a native library image in an implementation-
1747 * dependent manner.
1748 * <p>
1749 * The call <code>System.loadLibrary(name)</code> is effectively
1750 * equivalent to the call
1751 * <blockquote><pre>
1752 * Runtime.getRuntime().loadLibrary(name)
1753 * </pre></blockquote>
1754 *
1755 * @param libname the name of the library.
1756 * @exception SecurityException if a security manager exists and its
1757 * <code>checkLink</code> method doesn't allow
1758 * loading of the specified dynamic library
1759 * @exception UnsatisfiedLinkError if either the libname argument
1760 * contains a file path, the native library is not statically
1761 * linked with the VM, or the library cannot be mapped to a
1762 * native library image by the host system.
1763 * @exception NullPointerException if <code>libname</code> is
1764 * <code>null</code>
1765 * @see java.lang.Runtime#loadLibrary(java.lang.String)
1766 * @see java.lang.SecurityManager#checkLink(java.lang.String)
1767 */
1768 @CallerSensitive
1769 public static void loadLibrary(String libname) {
1770 Runtime.getRuntime().loadLibrary0(Reflection.getCallerClass(), libname);
1771 }
1772
1773 /**
1774 * Maps a library name into a platform-specific string representing
1775 * a native library.
1776 *
1777 * @param libname the name of the library.
1778 * @return a platform-dependent native library name.
1779 * @exception NullPointerException if <code>libname</code> is
1780 * <code>null</code>
1781 * @see java.lang.System#loadLibrary(java.lang.String)
1782 * @see java.lang.ClassLoader#findLibrary(java.lang.String)
1783 * @since 1.2
1784 */
1785 public static native String mapLibraryName(String libname);
1786
1787 /**
1788 * Create PrintStream for stdout/err based on encoding.
1789 */
1790 private static PrintStream newPrintStream(FileOutputStream fos, String enc) {
1791 if (enc != null) {
1792 try {
1793 return new PrintStream(new BufferedOutputStream(fos, 128), true, enc);
1794 } catch (UnsupportedEncodingException uee) {}
1795 }
1796 return new PrintStream(new BufferedOutputStream(fos, 128), true);
1797 }
1798
1799
1800 /**
1801 * Initialize the system class. Called after thread initialization.
1802 */
1803 private static void initializeSystemClass() {
1804
1805 // VM might invoke JNU_NewStringPlatform() to set those encoding
1806 // sensitive properties (user.home, user.name, boot.class.path, etc.)
1807 // during "props" initialization, in which it may need access, via
1808 // System.getProperty(), to the related system encoding property that
1809 // have been initialized (put into "props") at early stage of the
1810 // initialization. So make sure the "props" is available at the
1811 // very beginning of the initialization and all system properties to
1812 // be put into it directly.
1813 props = new Properties();
1814 initProperties(props); // initialized by the VM
1815
1816 // There are certain system configurations that may be controlled by
1817 // VM options such as the maximum amount of direct memory and
1818 // Integer cache size used to support the object identity semantics
1819 // of autoboxing. Typically, the library will obtain these values
1820 // from the properties set by the VM. If the properties are for
1821 // internal implementation use only, these properties should be
1822 // removed from the system properties.
1823 //
1824 // See java.lang.Integer.IntegerCache and the
1825 // VM.saveAndRemoveProperties method for example.
1826 //
1827 // Save a private copy of the system properties object that
1828 // can only be accessed by the internal implementation. Remove
1829 // certain system properties that are not intended for public access.
1830 VM.saveAndRemoveProperties(props);
1831
1832
1833 lineSeparator = props.getProperty("line.separator");
1834 sun.misc.Version.init();
1835
1836 FileInputStream fdIn = new FileInputStream(FileDescriptor.in);
1837 FileOutputStream fdOut = new FileOutputStream(FileDescriptor.out);
1838 FileOutputStream fdErr = new FileOutputStream(FileDescriptor.err);
1839 setIn0(new BufferedInputStream(fdIn));
1840 setOut0(newPrintStream(fdOut, props.getProperty("sun.stdout.encoding")));
1841 setErr0(newPrintStream(fdErr, props.getProperty("sun.stderr.encoding")));
1842
1843 // Load the zip library now in order to keep java.util.zip.ZipFile
1844 // from trying to use itself to load this library later.
1845 loadLibrary("zip");
1846
1847 // Setup Java signal handlers for HUP, TERM, and INT (where available).
1848 Terminator.setup();
1849
1850 // Initialize any miscellaneous operating system settings that need to be
1851 // set for the class libraries. Currently this is no-op everywhere except
1852 // for Windows where the process-wide error mode is set before the java.io
1853 // classes are used.
1854 VM.initializeOSEnvironment();
1855
1856 // The main thread is not added to its thread group in the same
1857 // way as other threads; we must do it ourselves here.
1858 Thread current = Thread.currentThread();
1859 current.getThreadGroup().add(current);
1860
1861 // register shared secrets
1862 setJavaLangAccess();
1863
1864 // Subsystems that are invoked during initialization can invoke
1865 // VM.isBooted() in order to avoid doing things that should
1866 // wait until the application class loader has been set up.
1867 // IMPORTANT: Ensure that this remains the last initialization action!
1868 VM.booted();
1869 }
1870
1871 private static void setJavaLangAccess() {
1872 // Allow privileged classes outside of java.lang
1873 SharedSecrets.setJavaLangAccess(new JavaLangAccess(){
1874 public sun.reflect.ConstantPool getConstantPool(Class<?> klass) {
1875 return klass.getConstantPool();
1876 }
1877 public boolean casAnnotationType(Class<?> klass, AnnotationType oldType, AnnotationType newType) {
1878 return klass.casAnnotationType(oldType, newType);
1879 }
1880 public AnnotationType getAnnotationType(Class<?> klass) {
1881 return klass.getAnnotationType();
1882 }
1883 public Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap(Class<?> klass) {
1884 return klass.getDeclaredAnnotationMap();
1885 }
1886 public byte[] getRawClassAnnotations(Class<?> klass) {
1887 return klass.getRawAnnotations();
1888 }
1889 public byte[] getRawClassTypeAnnotations(Class<?> klass) {
1890 return klass.getRawTypeAnnotations();
1891 }
1892 public byte[] getRawExecutableTypeAnnotations(Executable executable) {
1893 return Class.getExecutableTypeAnnotationBytes(executable);
1894 }
1895 public <E extends Enum<E>>
1896 E[] getEnumConstantsShared(Class<E> klass) {
1897 return klass.getEnumConstantsShared();
1898 }
1899 public void blockedOn(Thread t, Interruptible b) {
1900 t.blockedOn(b);
1901 }
1902 public void registerShutdownHook(int slot, boolean registerShutdownInProgress, Runnable hook) {
1903 Shutdown.add(slot, registerShutdownInProgress, hook);
1904 }
1905 public String newStringUnsafe(char[] chars) {
1906 return new String(chars, true);
1907 }
1908 public Thread newThreadWithAcc(Runnable target, AccessControlContext acc) {
1909 return new Thread(target, acc);
1910 }
1911 public void invokeFinalize(Object o) throws Throwable {
1912 o.finalize();
1913 }
1914 public String fastUUID(long lsb, long msb) {
1915 return Long.fastUUID(lsb, msb);
1916 }
1917 });
1918 }
1919 }